Underarm odor is a common problem caused by bacteria thriving in moist areas like the armpits. Many people reach for perfume to mask the smell, but this can actually make the odor worse. Natural remedies like alum stone, also known as potassium alum, are gaining popularity as a natural alternative to deodorants. Alum stone has antiseptic and astringent properties that help control body odor. If you’re struggling with underarm odor despite using deodorant and adjusting your lifestyle, consider switching to natural options like alum stone.